Ladder web with different colored bands



y 1944. E. J. GIBBONS 2,348,170

LADDER WEB WITH DIFFERENT COLORED BANDS Filed July 26, 1941 Z x; "i' I l E INVENTOR. [an/w J 6/55 0w Patented May 2, .1944

" Edwin J. Gibbons, East Providence, n. 1., asslgnor to Thomas French a Sons, Ltd., New York County, N. Y., a corporation of New York Application July 26, 1941, Serial No. 404,112

3 Claims.

This invention relates to ladder web, more particularly to webbing adapted for use in Venetian blinds and consisting of two outer bands with a series of cross-straps woven therebetween.

Ladder web of this type has been used for a great many years and recently there has come into use ladder web in which the two outer bands are made of different or contrasting colors. Since the cross-straps are normally woven into the outer bands in such a manner that portions of the warp threads thereof are visible from the outside of theouter bands, when diil'erent colors are used in. said bands some of the threads show through as contrasting in color and form blemishes on theouter surfaces of the outer bands. It is highly desirable, in order to have a readily saleable article, to alter the construction to eliminate said blemishes while at the same time pro- ,vide a sufficient strength in the structure to render it as effective as the ordinary ladder web.

The present invention is intended to provide a construction of ladder web wherein even though the outer bands are of contrasting colors, and regardless of the colors used in the cross-straps,

the said straps and bands may be woven together without any of the threads of the crossstraps being visible from the outside of the outer bands. 1

In practicing the invention, I *provide the two outer bands and the cross-straps as usual, but modify the construction, of the outer bands in such a manner that in the areas where the crossstraps are joined with the outer bands, the weave employed for the outer bands is a rib weave, such as a two and two or a three and three warp rib weave, and the number of threads per inch in the outer bands is greater than the number of threads per inch in the cross straps. Furthermore, the warp threads employed in the construction of the cross-straps are of a comparatively finer count or size than the threads employed in the construction of the outer bands and they are so woven into the body bands as to be entirely concealed from the outside of the outer band. The warp threads of the cross-straps are so woven into these areas that although it will be by the band weft, they lie within the band warps, being superimposed thereon and being concealed thereby from the outside of the outer bands.

Thereby, strong areas of junction of thebands and cross-straps are provided whereby the strength of the structure is at least equal to that of the ladder web when the old construction was used.

part hereof, and in which like reference characters indicate likeparts,

' to indicate the structure thereof:

Fig. 2 is an enlarged-fragmentary, cross-sectional view taken along the lines 2-2 of Fig. 1, and showing only the rib'weave construction of the outer band as it appears adjacent to the binding-in areas:

Fig. 3 is a similar view taken along the line 3-3 of Fig. 1, showing in detail the binding-in of the cross-straps with-the outer bands, the several threads being shown spaced apart to more clearly illustrate the structure of the present invention; and

Fig. 4 is a cross-sectional view taken along the line 4-4 of Fig. 1 and showing in detail the area of junction of cross-straps and outer bands.

The outer band i may be of a light color and the outer band 2 may be of a dark color for purpose of illustration of the present invention. Two

. sets of cross-straps 3 and 3 are provided between the outer bands I and 2, the general construction and arrangement of said cross-straps being old and well known in the art, there being no novelty in the present invention in the character and "positioning of such cross straps.

The weave of the outer bands I and 2, contrary to the previously used construction 01' outer bands, which was entirely of twill weave, is a combination of rib weave and twill weave. This is accomplished by making the side edges 5 and 5,

of the outer bands laterally adjacent to the crossstraps 3 and 3, respectively, or the twill weave. The areas 4 and 4', usually somewhat greater in width than the width of cross-straps 3 and 3', are 01. rib weave, preferably wherein a two and two or a three and three warp rib construction is provided. In the central portion 6 between the cross-straps 3 and 3' is a twill weave, as shown in Fig. 1.

By reason of the use of a rib weave in the areas immediately adjacent to the cross-straps and the increased density of structure in the outer band compared with the strap, it is possible in the areas of junction or interweaving between the cross straps and outer bands to provide perfect concealment of the warp threads of crossstraps 3 and 3', with a high degree of strength of binding-in. With reference particularly to Figs. 2, 3 and 4, the outer band I, for example, consists of warp threads 1 and 3 suitably inter- In the accompanying drawing, constituting a woven with a pair of welt threads, so that there are two weft threads in each shed. As shown in Fig. 2, a series 9 to 18, inclusive, of sheds are so formed, each of which contains two weft threads designated as 9'9", and so on. The strap warps are divided into two groups l9 and 20, each group being preferably the alternate threads of the cross-strap warps. Strap warps is interlace with weft thread 9" in shed 9, being concealed by band warps 8, then with strap weft M, which are located at the inner face of the band. Warps I 9 then pass over weft I2, then interlace with strap weft 22', pass over weft i5, interlace with strap weft 23', pass over weft i8, and interlace with strap weft 24-24 at the beginning of the formation of the woven crossstrap.

The group of strap warps 20 pass over weft I 0", being concealed from view from the outside of the band by band warps I. Warps 20 then interlace with strap weft 2| which are located at the inner face of the band, pass over weft l8", interlace with strap weft 22, pass over weft l6", interlace with strap weft 23,. pass over weft I8", and interlace with strap weft 'M28.

The upper stitching of strap warps l9 and 20 where they pass over and around the respective band wefts as set forth above, are concealed from view by reason of the band warps l and 8 being coarser yarn and having a greater number of threads per inch than said straps. As seenparticularly in Fig. 4, the strap warps are covered by the band vwrps to render the same invisible from the outside 25 of the webbing.

From the above construction it will be seen that there is a full and complete binding-in of the cross-strap warps into the areas of Junction with the outer bands. Therefore, the strength of binding-in throughout the area is at least equal to that heretofore obtained by the construction wherein the strap warps were visible from the outside of the outer bands. In addition, the appearance of the outer bands has been made distinctive by the use of a combination of twill weave and rib weave. This provides a design which is unusual and striking in a ladder web; The present invention is designed particularly for a ladder web in which the two outer bands are of contrasting colors. If desired, the same construction and arrangement may be applied to ladder web wherein the colors of said bands do ors, the final result being the same, namely, that none of the colors of the cross-strap will be visible from the outside of the ladder web.

In describing the invention, the cross-straps were indicated as being woven with weft, but it is possible to omit the strap weft and provide a suitable webbing having weftless straps and without the strengthening ribs. The interlacing of the strap warps with the bands may be made in each of the sheds of the binding-in areas.

What I claim is:

1. Ladder web comprising two outer br nds composed of warp woven with band weft, a series of cross-strap warp threads alternately woven into said bands providing areas of junction of bands and cross-straps, the strap warps in the areas of junction lying on the inner faces of said bands and being woven into the outer bands by the band weft, the weave of said bands at said areas being two and two warp rib,'the strap warps in the areas of junction being interlaced with one of the two weft threads in each shed, one group ofstrap warps being interlaced into spaced apart sheds and another group of said strap warps into intermediate sheds, said strap warps being concealed from the outer faces of said bands by the band warps interposed between said strap warps and said outer faces.

2. Ladder web comprising two outer bands composed of warp woven with band weft, a series of cross-strap warp threads alternately'woven into said bands providing areas of junction of bands and cross-straps, the strap warps in the areas of junction lying on the inner faces of said bands and being woven into the outer bands by the band weft, the weaverof said bands at said areas being two and two warp rib, the strap warps in the areas of junction being interlaced with one of the two weft threads in each shed, one group of strap warps being interlaced into spaced apart. sheds and another group of said strap warps into intermediate sheds, said strap warps being interlaced with strap weft within the binding-in area to form a series of strer'zthening ribs, said strap warps being concealed from the outer faces of said bands by the band warps interposed between said strap warps and said outer faces.

' 3. Ladder web comprising two outer bands composed of warp woven with band weft, a series of cross-strap warp threads alternately woven into said bands providing areas of junction of bands and cross-straps, the strap warps in the areas of junction lying on the inner faces of said bands and being woveninto the outer bands by the band weft, the weave of said bands at said areas being two and two warp rib, the strap warps in the areas of junction being interlaced with one of the two weft threads in each shed. one group of strap warps being interlaced into spacedapart sheds and another group of said strap warps into intermediate sheds, said strap warps being interlaced with strap weft within the binding-in area to form a series of strengthening ribs, the band sheds adjacent said ribs being woven with band warp and band-weft only, said strap warps being concealed from the outerfaces of said bands by the band warps interposed between said strap warps and said outer faces.

EDWIN J. GIBBONS. 

